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  <title>Return the traits used by the given class</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.class-uses" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">class_uses</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.4.0, PHP 7)</p><p class="refpurpose"><span class="refname">class_uses</span> &mdash; <span class="dc-title">
   Return the traits used by the given class
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.class-uses-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>class_uses</strong></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$class</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$autoload</code><span class="initializer"> = <strong><code>TRUE</code></strong></span></span>
  ] ) : <span class="type">array</span></div>

  <p class="para rdfs-comment">
   This function returns an array with the names of the traits that the
   given <code class="parameter">class</code> uses. This does however not include
   any traits used by a parent class.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.class-uses-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">class</code></dt>

     <dd>

      <p class="para">
       An object (class instance) or a string (class name).
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">autoload</code></dt>

     <dd>

      <p class="para">
       Whether to allow this function to load the class automatically through
       the <span class="function"><a href="autoload.html" class="function">__autoload()</a></span> magic method.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>



 <div class="refsect1 returnvalues" id="refsect1-function.class-uses-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   An array on success, or <strong><code>FALSE</code></strong> on error.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.class-uses-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="regexiterator.accept.example.basic">
    <p><strong>Example #1 <span class="function"><strong>class_uses()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">trait&nbsp;</span><span style="color: #0000BB">foo&nbsp;</span><span style="color: #007700">{&nbsp;}<br />class&nbsp;</span><span style="color: #0000BB">bar&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;use&nbsp;</span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">class_uses</span><span style="color: #007700">(new&nbsp;</span><span style="color: #0000BB">bar</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">class_uses</span><span style="color: #007700">(</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">));<br /><br />function&nbsp;</span><span style="color: #0000BB">__autoload</span><span style="color: #007700">(</span><span style="color: #0000BB">$class_name</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;require_once&nbsp;</span><span style="color: #0000BB">$class_name&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">'.php'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;use&nbsp;__autoload&nbsp;to&nbsp;load&nbsp;the&nbsp;'not_loaded'&nbsp;class<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">class_uses</span><span style="color: #007700">(</span><span style="color: #DD0000">'not_loaded'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">true</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Array
(
    [foo] =&gt; foo
)

Array
(
    [foo] =&gt; foo
)

Array
(
    [trait_of_not_loaded] =&gt; trait_of_not_loaded
)
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.class-uses-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="class_parents.html" class="function" rel="rdfs-seeAlso">class_parents()</a> - 返回指定类的父类。</span></li>
    <li class="member"><span class="function"><a href="get_declared_traits.html" class="function" rel="rdfs-seeAlso">get_declared_traits()</a> - 返回所有已定义的 traits 的数组</span></li>
   </ul>
  </p>
 </div>

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